RFR: 8209375: ZGC: Use dynamic base address for mark stack space

[Per Liden]

Thanks Erik!

/Per

On 08/13/2018 02:01 PM, Erik Österlund wrote:
> Hi Per,
> 
> Looks good.
> 
> Thanks,
> /Erik
> 
> On 2018-08-13 09:53, Per Liden wrote:
>> We're currently using a fixed address space range for the mark stack 
>> space, both in terms of it's base address and it's size. This isn't 
>> really needed, we could just as well let os::reserve_memory() pick and 
>> address range for us and only reserve ZMarkStackSpaceLimit bytes, 
>> instead of 1TB.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8209375
>> Webrev: http://cr.openjdk.java.net/~pliden/8209375/webrev.0
>>
>> /Per
>